Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include <sys/wait.h> | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <sys/param.h> | |
28 | #include <sys/dir.h> | |
29 | #include <sys/user.h> | |
30 | #include <signal.h> | |
31 | #include <sys/ioctl.h> | |
32 | #if 0 | |
33 | #include <sgtty.h> | |
34 | #endif | |
35 | #include <fcntl.h> | |
36 | ||
37 | /***************Begin MY defs*********************/ | |
38 | int quit_flag = 0; | |
39 | char registers[REGISTER_BYTES]; | |
40 | ||
41 | /* Index within `registers' of the first byte of the space for | |
42 | register N. */ | |
43 | ||
44 | ||
45 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
46 | /***************End MY defs*********************/ | |
47 | ||
48 | #include <sys/ptrace.h> | |
49 | ||
50 | #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) | |
51 | #include <sys/reg.h> | |
52 | #endif | |
53 | ||
54 | extern char **environ; | |
55 | extern int errno; | |
56 | extern int inferior_pid; | |
57 | void quit (), perror_with_name (); | |
58 | int query (); | |
59 | ||
60 | /* Start an inferior process and returns its pid. | |
61 | ALLARGS is a vector of program-name and args. | |
62 | ENV is the environment vector to pass. */ | |
63 | ||
64 | int | |
65 | create_inferior (program, allargs) | |
66 | char *program; | |
67 | char **allargs; | |
68 | { | |
69 | int pid; | |
70 | ||
71 | pid = fork (); | |
72 | if (pid < 0) | |
73 | perror_with_name ("fork"); | |
74 | ||
75 | if (pid == 0) | |
76 | { | |
77 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
78 | ||
79 | execv (program, allargs); | |
80 | ||
81 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
82 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
83 | fflush (stderr); | |
84 | _exit (0177); | |
85 | } | |
86 | ||
87 | return pid; | |
88 | } | |
89 | ||
90 | /* Kill the inferior process. Make us have no inferior. */ | |
91 | ||
92 | void | |
93 | kill_inferior () | |
94 | { | |
95 | if (inferior_pid == 0) | |
96 | return; | |
97 | ptrace (PTRACE_KILL, inferior_pid, 0, 0); | |
98 | wait (0); | |
c5aa993b | 99 | /*************inferior_died ();****VK**************/ |
c906108c SS |
100 | } |
101 | ||
102 | /* Return nonzero if the given thread is still alive. */ | |
103 | int | |
104 | mythread_alive (pid) | |
105 | int pid; | |
106 | { | |
107 | return 1; | |
108 | } | |
109 | ||
110 | /* Wait for process, returns status */ | |
111 | ||
112 | unsigned char | |
113 | mywait (status) | |
114 | char *status; | |
115 | { | |
116 | int pid; | |
117 | union wait w; | |
118 | ||
119 | pid = wait (&w); | |
120 | if (pid != inferior_pid) | |
121 | perror_with_name ("wait"); | |
122 | ||
123 | if (WIFEXITED (w)) | |
124 | { | |
125 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
126 | *status = 'W'; | |
127 | return ((unsigned char) WEXITSTATUS (w)); | |
128 | } | |
129 | else if (!WIFSTOPPED (w)) | |
130 | { | |
131 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
132 | *status = 'X'; | |
133 | return ((unsigned char) WTERMSIG (w)); | |
134 | } | |
135 | ||
136 | fetch_inferior_registers (0); | |
137 | ||
138 | *status = 'T'; | |
139 | return ((unsigned char) WSTOPSIG (w)); | |
140 | } | |
141 | ||
142 | /* Resume execution of the inferior process. | |
143 | If STEP is nonzero, single-step it. | |
144 | If SIGNAL is nonzero, give it that signal. */ | |
145 | ||
146 | void | |
147 | myresume (step, signal) | |
148 | int step; | |
149 | int signal; | |
150 | { | |
151 | errno = 0; | |
152 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
153 | if (errno) | |
154 | perror_with_name ("ptrace"); | |
155 | } | |
156 | ||
157 | ||
158 | #if !defined (offsetof) | |
159 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
160 | #endif | |
161 | ||
162 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
163 | #if !defined (U_REGS_OFFSET) | |
164 | #define U_REGS_OFFSET \ | |
165 | ptrace (PT_READ_U, inferior_pid, \ | |
166 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
167 | - KERNEL_U_ADDR | |
168 | #endif | |
169 | ||
170 | #ifndef TARGET_M68K | |
171 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ | |
172 | /* symbols like 'EAX' come from <sys/reg.h> */ | |
c5aa993b | 173 | static int regmap[] = |
c906108c SS |
174 | { |
175 | EAX, ECX, EDX, EBX, | |
176 | UESP, EBP, ESI, EDI, | |
177 | EIP, EFL, CS, SS, | |
178 | DS, ES, FS, GS, | |
179 | }; | |
180 | ||
181 | int | |
182 | i386_register_u_addr (blockend, regnum) | |
183 | int blockend; | |
184 | int regnum; | |
185 | { | |
186 | #if 0 | |
187 | /* this will be needed if fp registers are reinstated */ | |
188 | /* for now, you can look at them with 'info float' | |
189 | * sys5 wont let you change them with ptrace anyway | |
190 | */ | |
c5aa993b | 191 | if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) |
c906108c SS |
192 | { |
193 | int ubase, fpstate; | |
194 | struct user u; | |
195 | ubase = blockend + 4 * (SS + 1) - KSTKSZ; | |
c5aa993b | 196 | fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u); |
c906108c | 197 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); |
c5aa993b | 198 | } |
c906108c SS |
199 | else |
200 | #endif | |
201 | return (blockend + 4 * regmap[regnum]); | |
c5aa993b | 202 | |
c906108c SS |
203 | } |
204 | #else /* TARGET_M68K */ | |
205 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
c5aa993b | 206 | static int regmap[] = |
c906108c SS |
207 | { |
208 | #ifdef PT_D0 | |
209 | PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, | |
210 | PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, | |
211 | PT_SR, PT_PC, | |
212 | #else | |
213 | 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, | |
214 | 17, 18, | |
215 | #endif | |
216 | #ifdef PT_FP0 | |
217 | PT_FP0, PT_FP1, PT_FP2, PT_FP3, PT_FP4, PT_FP5, PT_FP6, PT_FP7, | |
218 | PT_FPCR, PT_FPSR, PT_FPIAR | |
219 | #else | |
220 | 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47 | |
221 | #endif | |
222 | }; | |
223 | ||
224 | /* BLOCKEND is the value of u.u_ar0, and points to the place where GS | |
225 | is stored. */ | |
226 | ||
227 | int | |
228 | m68k_linux_register_u_addr (blockend, regnum) | |
229 | int blockend; | |
230 | int regnum; | |
231 | { | |
c5aa993b | 232 | return (blockend + 4 * regmap[regnum]); |
c906108c SS |
233 | } |
234 | #endif | |
235 | ||
236 | CORE_ADDR | |
237 | register_addr (regno, blockend) | |
238 | int regno; | |
239 | CORE_ADDR blockend; | |
240 | { | |
241 | CORE_ADDR addr; | |
242 | ||
243 | if (regno < 0 || regno >= ARCH_NUM_REGS) | |
244 | error ("Invalid register number %d.", regno); | |
245 | ||
246 | REGISTER_U_ADDR (addr, blockend, regno); | |
247 | ||
248 | return addr; | |
249 | } | |
250 | ||
251 | /* Fetch one register. */ | |
252 | ||
253 | static void | |
254 | fetch_register (regno) | |
255 | int regno; | |
256 | { | |
257 | register unsigned int regaddr; | |
258 | register int i; | |
259 | ||
260 | /* Offset of registers within the u area. */ | |
261 | unsigned int offset; | |
262 | ||
263 | offset = U_REGS_OFFSET; | |
264 | ||
265 | regaddr = register_addr (regno, offset); | |
266 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
267 | { | |
268 | errno = 0; | |
c5aa993b JM |
269 | *(int *) ®isters[regno * 4 + i] = ptrace (PTRACE_PEEKUSR, inferior_pid, |
270 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
c906108c SS |
271 | regaddr += sizeof (int); |
272 | if (errno != 0) | |
273 | { | |
274 | /* Warning, not error, in case we are attached; sometimes the | |
275 | kernel doesn't let us at the registers. */ | |
276 | char *err = strerror (errno); | |
277 | char *msg = alloca (strlen (err) + 128); | |
278 | sprintf (msg, "reading register %d: %s", regno, err); | |
279 | error (msg); | |
280 | goto error_exit; | |
281 | } | |
282 | } | |
c5aa993b | 283 | error_exit:; |
c906108c SS |
284 | } |
285 | ||
286 | /* Fetch all registers, or just one, from the child process. */ | |
287 | ||
288 | void | |
289 | fetch_inferior_registers (regno) | |
290 | int regno; | |
291 | { | |
292 | if (regno == -1 || regno == 0) | |
c5aa993b | 293 | for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) |
c906108c SS |
294 | fetch_register (regno); |
295 | else | |
296 | fetch_register (regno); | |
297 | } | |
298 | ||
299 | /* Store our register values back into the inferior. | |
300 | If REGNO is -1, do this for all registers. | |
301 | Otherwise, REGNO specifies which register (so we can save time). */ | |
302 | ||
303 | void | |
304 | store_inferior_registers (regno) | |
305 | int regno; | |
306 | { | |
307 | register unsigned int regaddr; | |
308 | register int i; | |
309 | unsigned int offset = U_REGS_OFFSET; | |
310 | ||
311 | if (regno >= 0) | |
312 | { | |
313 | #if 0 | |
314 | if (CANNOT_STORE_REGISTER (regno)) | |
315 | return; | |
316 | #endif | |
317 | regaddr = register_addr (regno, offset); | |
318 | errno = 0; | |
319 | #if 0 | |
320 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
c5aa993b JM |
321 | { |
322 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; | |
323 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
324 | scratch, 0); | |
325 | if (errno != 0) | |
326 | { | |
c906108c | 327 | /* Error, even if attached. Failing to write these two |
c5aa993b JM |
328 | registers is pretty serious. */ |
329 | sprintf (buf, "writing register number %d", regno); | |
330 | perror_with_name (buf); | |
331 | } | |
332 | } | |
c906108c SS |
333 | else |
334 | #endif | |
c5aa993b | 335 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
c906108c SS |
336 | { |
337 | errno = 0; | |
338 | ptrace (PTRACE_POKEUSR, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
339 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); | |
340 | if (errno != 0) | |
341 | { | |
342 | /* Warning, not error, in case we are attached; sometimes the | |
343 | kernel doesn't let us at the registers. */ | |
344 | char *err = strerror (errno); | |
345 | char *msg = alloca (strlen (err) + 128); | |
346 | sprintf (msg, "writing register %d: %s", | |
347 | regno, err); | |
348 | error (msg); | |
349 | return; | |
350 | } | |
c5aa993b | 351 | regaddr += sizeof (int); |
c906108c SS |
352 | } |
353 | } | |
354 | else | |
c5aa993b | 355 | for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) |
c906108c SS |
356 | store_inferior_registers (regno); |
357 | } | |
358 | ||
359 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
360 | in the NEW_SUN_PTRACE case. | |
361 | It ought to be straightforward. But it appears that writing did | |
362 | not write the data that I specified. I cannot understand where | |
363 | it got the data that it actually did write. */ | |
364 | ||
365 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
366 | to debugger memory starting at MYADDR. */ | |
367 | ||
368 | void | |
369 | read_inferior_memory (memaddr, myaddr, len) | |
370 | CORE_ADDR memaddr; | |
371 | char *myaddr; | |
372 | int len; | |
373 | { | |
374 | register int i; | |
375 | /* Round starting address down to longword boundary. */ | |
376 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
377 | /* Round ending address up; get number of longwords that makes. */ | |
378 | register int count | |
379 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
380 | /* Allocate buffer of that many longwords. */ | |
381 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
382 | ||
383 | /* Read all the longwords */ | |
384 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
385 | { | |
386 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); | |
387 | } | |
388 | ||
389 | /* Copy appropriate bytes out of the buffer. */ | |
390 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
391 | } | |
392 | ||
393 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
394 | to inferior's memory at MEMADDR. | |
395 | On failure (cannot write the inferior) | |
396 | returns the value of errno. */ | |
397 | ||
398 | int | |
399 | write_inferior_memory (memaddr, myaddr, len) | |
400 | CORE_ADDR memaddr; | |
401 | char *myaddr; | |
402 | int len; | |
403 | { | |
404 | register int i; | |
405 | /* Round starting address down to longword boundary. */ | |
406 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
407 | /* Round ending address up; get number of longwords that makes. */ | |
408 | register int count | |
409 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
410 | /* Allocate buffer of that many longwords. */ | |
411 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
412 | extern int errno; | |
413 | ||
414 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
415 | ||
416 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); | |
417 | ||
418 | if (count > 1) | |
419 | { | |
420 | buffer[count - 1] | |
421 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, | |
422 | addr + (count - 1) * sizeof (int), 0); | |
423 | } | |
424 | ||
425 | /* Copy data to be written over corresponding part of buffer */ | |
426 | ||
427 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
428 | ||
429 | /* Write the entire buffer. */ | |
430 | ||
431 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
432 | { | |
433 | errno = 0; | |
434 | ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]); | |
435 | if (errno) | |
436 | return errno; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | \f | |
442 | void | |
443 | initialize () | |
444 | { | |
445 | inferior_pid = 0; | |
446 | } | |
447 | ||
448 | int | |
449 | have_inferior_p () | |
450 | { | |
451 | return inferior_pid != 0; | |
452 | } |